Research on the mechanism of asymmetric deformation and stability control of near-fault roadway under the influence of mining

Shan, Renliang; Li, Zhaolong; Wang, Chunhe; Wei, Yonghui; Bai, Yilong; Zhao, Yan; Tong, Xiao

doi:10.1016/j.engfailanal.2021.105492

Cited by 34 publications

(12 citation statements)

References 25 publications

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“…After the completion of mining in the adjacent working face, a mining space is formed, and the overlying rock layers gradually collapse, fracture, and rotate, ultimately forming stable cantilever beam structures and masonry beam structures, 40 as shown in Figure 6. The CSNG is subjected to excavation unloading and compression of overlying rock layers, resulting in stress concentration and deflection of the principal stress direction 41,42 . As the thickness of the coal seam increases, the rotation angle of the overlying strata increases, and the stress concentration and deflection angle of the principal stress direction will also change.…”

Section: Theoretical Analysis Of Influencing Factorsmentioning

confidence: 99%

“…The CSNG is subjected to excavation unloading and compression of overlying rock layers, resulting in stress concentration and deflection of the principal stress direction. 41,42 As the thickness of the coal seam increases, the rotation angle of the overlying strata increases, and the stress concentration and deflection angle of the principal stress direction will also change.…”

Section: Stress Environmentmentioning

confidence: 99%

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Research on the deformation mechanism and ACC control technology of gob‐side roadway in an extra‐thick coal seam with varying thickness

Shan,

Liu,

Wang

et al. 2024

Energy Science & Engineering

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To improve the extraction of coal resources, gob‐side entry driving is gradually being promoted and applied. However, as the thickness of the coal seam increases, the deformation control of the roadway becomes more difficult. Aiming at this problem, a combination of theoretical calculation, numerical simulation, and field test was used to analyze the aspects of the stress environment, surrounding rock properties, and support forms. The phenomenon and mechanization of intensified deformation and failure of roadway with increasing coal seam thickness were revealed. The specific results include: (1) The ratio of principal stress at the excavation position controls the maximum failure depth of roadway, and the direction of principal stress determines the location of the maximum failure depth; (2) As the thickness of the coal seam increases, the properties of the surrounding rock at the excavation position decrease, the principal stress ratio increases, and the deflection angle of the principal stress increases, which lead to an intensification of the deformation and failure of the roadway. Based on the deformation and failure characteristics of the roadway and the shortcomings of the original support form, a control strategy and support scheme based on a new support structure called “Anchor Cable with C‐shaped Tube” is proposed, which has achieved better deformation control effect in on‐site application.

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Section: Theoretical Analysis Of Influencing Factorsmentioning

confidence: 99%

Section: Stress Environmentmentioning

confidence: 99%

Research on the deformation mechanism and ACC control technology of gob‐side roadway in an extra‐thick coal seam with varying thickness

Shan,

Liu,

Wang

et al. 2024

Energy Science & Engineering

Self Cite

View full text Add to dashboard Cite

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“…Deep mining has also caused the length of affected roadways to increase year by year (Zhang et al, 2021), and the proportion of complex and difficult supporting roadways is increasing (Yang et al, 2018), especially the dynamic pressure gateways with small coal pillars. The deformation of roadways is generally strong, resulting in a larger range of plastic zones (Guo et al, 2019;Ma et al, 2019) and more diversified forms (Shan et al, 2021;Ren et al, 2022). Due to the larger scope of mining (Zhao, 2014), violent movement of overlying strata , and the generation of void fraction (Wang et al, 2016;, some bolts and cables are broken, causing serious damage, which makes it difficult to maintain the gateway and poses a higher challenge to safety production (Xie et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Research on the breaking mechanism of bolts and cables in the gateway driven along a small coal pillar in the Datong mining area and the corresponding control technology

Cheng

2023

Front. Earth Sci.

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The gateway of the thick coal seam working face in the Datong mining area was excavated along a small coal pillar, resulting in serious bolt (cable) breaking failure, strong surrounding rock deformation, serious ground pressure appearance, and difficulties surrounding rock control. So, the bolt (cable) breaking characteristics and corresponding causes of the 5106 return air gateway with a small coal pillar in Dongzhouyao coal mine (a mine in the Datong mining area) were analyzed through an on-site investigation, surrounding rock geotechnical parameters test, theoretical analysis, laboratory experiment, on-site engineering test, and other research means. The study carried out laboratory testing and analysis on the stress distribution characteristics and laws of the bolts, put forward the bolt (cable) breaking mechanism and prevention countermeasures, and completed the field industrial test of the surrounding rock pressure relief and support joint control technology in the gateway. The on-site tracking and data showed that the breaking conditions of the bolts (cables) were significantly reduced by improving the initial force of the bolts (cables), optimizing the supporting materials and components, canceling the pressure ring, and implementing the hydraulic fracturing top cutting and pressure relief + high prestressed full cable support technology. The displacement of the top and bottom plates was reduced by 51%, the displacement of the two sides was reduced by 46%, and the influence distance of the working face advance stress was reduced from 85 m to 30 m. The successful implementation of the study results in the small pillar gateway of the Dongzhouyao coal mine provided a reference for the promotion and application of similar gateway conditions in the Datong mining area.

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“…The rocks near the fault structure often have poor self-stabilizing abilities 21 , 22 . Many studies have been performed on fault activation 23 , 24 and fault-induced disasters 25 , 26 . Studies show that the fault has great influence on the stability of the roadway 27 – 30 .…”

Section: Introductionmentioning

confidence: 99%

Strata behaviour and stability control of the automatic roadway formation by roof cutting below a fault influenced longwall goaf

Gao

Gai

Zhang

et al. 2022

Sci Rep

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Automatic roadway formation by roof cutting (ARFRC) is a novel nonpillar mining method that has the potential to dramatically increase coal recovery while reducing the roadway excavation ratio. When this method is used below a fault influenced longwall goaf, large deformation and support failure occur in the roadway using conventional roadway formation techniques. In the study, the ARFRC method was tested in the Liliu mining area of China, which is characterized by goafs and faults. Field experiments and numerical modelling were used to evaluate the stability of the roadway by analysing the behaviour of overlying strata under the special geological condition. The results show that the surroundings of the formed roadway were greatly affected by the fault and the overlying coal pillar in the goaf. In the fault- and coal pillar-affected areas, the loads on the roadway roof increased by approximately 35% and 15%, respectively. According to the strata behaviour of the formed roadway surroundings, targeted support techniques for ARFRC were proposed, and the reliability of the support techniques were demonstrated by field practice.

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Research on the mechanism of asymmetric deformation and stability control of near-fault roadway under the influence of mining

Cited by 34 publications

References 25 publications

Research on the deformation mechanism and ACC control technology of gob‐side roadway in an extra‐thick coal seam with varying thickness

Research on the deformation mechanism and ACC control technology of gob‐side roadway in an extra‐thick coal seam with varying thickness

Research on the breaking mechanism of bolts and cables in the gateway driven along a small coal pillar in the Datong mining area and the corresponding control technology

Strata behaviour and stability control of the automatic roadway formation by roof cutting below a fault influenced longwall goaf

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